Mechanical: ruff format, and ruff check --fix with the rule set every NAPALM
driver uses (E, F, I, UP, B at line length 100, Python 3.10). What ruff
cannot fix comes in the next commit.
Split from monolithic openwrt.py into separate mixin files for
interfaces, VLANs, packages, routing, wireless, LLDP, and config.
Already in use by the main driver; just missing from git tracking.
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
Christian Manivong